Telephonic apparatus



v (No Model.)

J. F. MGLAUGHLIN.

TELEPHONIG APPARATUS.

No. 355,189.- Patented DeopZS, 1886.

IIINIIIHI'IHNIIIIII' Zin uwumgmpm NirE STATES PATENT EEICE.,

JAMES F. MCLAUGHLIN, OF PHILADELPHIA, PENNSYLVANIA.

TELEPHONIC'APPARATUS.

SPECIFICATION forming part of Letters Patent Not 355,189, dated December 28, 1886.

Application filed May 29, 1886.

To all whom it may concern: f

Beitknown that I, JAMEs F. MoLAUGHLiN, a citizen of the United States, and a resident of Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented certain new and useful ImprovementsY in Telephonie Apparatus, of which the following is a specification.

The object of my invention is to effect an improvement on my Aprevious Patent N0. 828,702, dated October 20, 1885, for the transmission of intelligence by vocal sounds, sign, or speech by` magnetic or electric impulses, whereby the sounds are increased in volume and intensity and greatly amplified.

ln carrying out my invention the wellknown magneto-electric machine maybe used, or any suitable machine for generating electricity.

The main features of vmy invention consist of enlarged metallic diaphragms or disks inclosed by mutable air-chambers, which concentrate at a certain point, either at the receiver or transmitter, and in the peculiar arrangement of the held-magnet, together with minor parts, which will be hereinafter more particularly described, and pointed outin the claims.

The drawing represents a sectional view of appliances embodyingmy invention.

In the drawing, Arepresents the box, of any desired form or material.

a c are thin disks of metal, (preferably ,.iron,) which are secured at the two `opposite ends of the box A. l

B is an electric bell,secured in any suitable manner in the box, as is also a magneto-electric machine, C.

G is a round flexible tube attached to the air-chamber E, and on one end of which is secured the mouth-piece g.

c c are the poles of the field-magnet and generator C.

o 0 are extensions, which may be separated or secured to the poles in any suitable manner.

E E represent air-chambers attached to the sides of the box for the purpose of amplifying or confining the sound.

vThe generating-machine may be of any suitable or desired` construction, and disposed or located as circumstances dictate. `The extensions c c Serial No. 203,601. (No model.)

are brought to within a short distance of the inner sides of the ends of the box, as shown in the drawing, and around them and the whole length of the magnets of the generator is wrapped a layer or coil of wire for the purpose of intensifying the magnetic and electric effect produced .by the 'vibration of the ends of the box. One end of this wire is connected to line through binding-post X, and the other through binding-post Z. Such construction provides a dynamo or magneto-electric machine, the field magnets of which are Wrapped with an extension of vthe line-wire connected to the ground-wire. The thin vibratory ends of the inclosing -box, the airchamber, and the aural tube are for the purpose ofcontining and amplifying anysounds or signals the apparatus may transmit or receive.

From the foregoing it is apparent that whenever a call is made or the armature of the genmagnets is re-enforced. It will also/be seen that the means for automatically maintaining the efficiency of the apparatus and transmitting device is contained within the apparatus itself.

If from continued disuse the sounds reproduced are indistinct or weak, the maximum efficiency can instantly be regained by a rotation of the armature.

I would here state that l do not confine myself to the use of an aural tube to only one end of theair-chamber, as either end may be used to transmit or receive sounds or signs, according to the option of the user. Neither do I sion-pieces of the field-magnets, as the apparatus will perform its work without such extension-pieces.

Having thus described th e nature, operation,

and desire to secure by Letters Patent, is

l. In combination with the box A, made without ends, the magnetic diaphragm a a, secured to the said box and forming the ends thereof, and the tapering air-chambers E E', terminating in the earor speaking tubes, as set forth.

2. Incombination, the box A, the magnetic diaphragms a a, forming the ends thereof, the magnet having extensions c 0 ending near the diaphragms, and the line-wire coiled erator is rotated, the magnetism of the eldand advantages of my invention, what I cla-im, Y

wish to confine myself to the use of the exten- IOO around the magnet and its extensions, as set being wound along the whole body of the magforth. net and being also connected to the line-wire,

3. In combination, the box having mag` as and for the purpose set forth. netic diaphragms a a, forming its ends, the Signed at Philadelphia, in the county of x 5 5 air-ehambers tapering to their eenters,and theV Philadelphia, and State of Pennsylvania, this generator having the line-Wire coiled around 21st day of May, A. D. 1886. the full lengthy of its magnet, as set forth. i

4. In atelephonereceiver,the combination, l JAMES F' MCLAUGHLIN' with a magneto-generator, of two magnetic ro diaphragms, one in proximity to each of thepoles thereof, the coils of the said generator Witnesses: l

FRANK M. MILLER, JULIUs HIRsHFELD. 

